TOKYO — Japan was rattled by a strong aftershock and tsunami warning Thursday night nearly a month after a devastating earthquake and tsunami flattened the northeastern coast. The Japan meteorological agency issued a tsunami warning for a wave of up to one meter (3.2 feet). The warning was issued for a coastal area already torn apart by last month's tsunami.. Japan's NHK public television said those in areas where the tsunami warnings were issued should evacuate to higher ground.